Who are those who are not able to receive the knowledge?

SHAFAQNA – Imam Ali (AS) told Komail: Know that in here (pointing to his chest) a lot of knowledge is stored, wishing I could find those who could learn it. Yes, I find clever ones but they are not reliable, they use religion as a tool for the world, they boast to people with God’s blessings and divine reason;, or a group submitting to conveyors of truth without having insight into the truth, who doubts root in their hearts with first suspicion; therefore neither those nor these deserve to learn my abundant knowledge. Or the one who is after enjoyments and has lost his will to lust, or the one who is greedily amass wealth; none of them can be guardians of religion and look more grazing beasts, and this is why knowledge dies with the death of those who have it [1].